High-temperature oxidation resistant coating for steel with high nickel content

Abstract

The invention relates to a high-temperature oxidation resistant coating for steel with high nickel content, which is characterized by being prepared by mixing mixed powder of silicon oxide, alumina, chromium-containing iron powder, magnesia and zirconium oxide with high-temperature adhesive, wherein the mixed powder contains the ingredients in percentage by mass as follows: 10-25% of SiO2, 20-35% of Al2O3, 35-60% of chromium-containing powder, 0-15% of MgO, and 20-15% of ZrO2, wherein the content of the MgO and the ZrO2 can not be 0 simultaneously. The high-temperature oxidation resistant coating has the beneficial effects that by using the coating, iron oxide sheet generated in the heating process of alloy steel billet with the nickel content above 4% can be reduced, and more importantly, the adhesive force of the iron oxide sheet of the steel billet is greatly reduced and can be basically removed under the condition of the existing processing equipment, thus reducing the scrap rate caused by the iron oxide sheet by above 50%.

Description

Technical field [0001] The invention relates to a water-based inorganic high-temperature resistant coating used to slow down the surface oxidation of a nickel-containing steel billet during the heating process and make the oxide scale easy to remove. Background technique [0002] Iron oxide scale is an unavoidable defect on the surface of steel plates in hot rolling production. For nickel-containing steel plates, iron oxide scale is particularly harmful, especially when the area is large, the iron scale is thick, and it is difficult to remove with existing equipment and methods, manual grinding wheels are required. Machine repair and grinding are time-consuming and labor-intensive, and affect the surface quality of the steel plate, and even cause the steel plate to waste. Therefore, how to reduce and effectively remove the oxide scale of the billet after heating has always been one of the difficult problems for hot rolling enterprises to overcome. [0003] At present, one of the m...

AI Technical Summary

Problems solved by technology

However, in this method, when the temperature of the heating furnace exceeds 1300°C, or the residence time of the billet in the heating furnace is too long due to equipment failure (for example, the residence time exceeds 300 minutes), the anti-oxidation effect of the coating will drop sharply, resulting in surface defects of the rolled plate. Increase

In addition, this method is still not easy to remove the oxide scale when the high-pressure water descaling is performed on the alloy steel with a nickel content higher than 4.0%.